Tube-forming die



Feb. 28, 1928.

F. COATES TUBE FORMING DIE Filed Nov. 1, 1923 2 Sheets-Sheet 1 M r MTUBE FORMING DIE Sheets-Shea: 2

Filed Nov. 1, 192;

Patented Feb. 28, 1928.

UNITEDSTATES- FREDERICK COATES, or CINCINNATI, OHIO, essIeNOn TOnIcIImoNn rmnrnoor noon GOMPANY, or nIOI mONn, INDIANA, A CORPORATION orINDIANA.

TUBE-FORMING DIE.

Application filed November 1, 1923. Serial No. 672,127.

1 adapted for completely forming the tubular shapes desired.

In the companion application the appa ratus shown combines the effect ofdrawing dies and hammering dies or pressing dies. In the presentinstance, the same main dies are used, and in connection therewith thedelivery ends of these dies are peculiarly formed so that the materialmay be completely bent to its entirely finished form even though it bein the form of a closed tube.

With the above and other objects in view, this invention consists of anovel die arrangement wherein completely tubular forms may be producedfrom strip material by a combined drawing and hammering operation.

In the accompanying drawings there is illustrated a pair of diessuitable for this purpose, and a variet of forms which may be producedby such ies, like characters of reference being employed to illustratelike parts inthe severalviews. In the drawings,

Fig. 1 is a side elevation of a pair of dies constructed in accordancewith this invention.

Fig.2 is a section on the line2-2 of Fig.1.

Fig. 3 is a section on the line 3-3 of Fig. 1.

Fi s. 4 and 5 illustrate certain forms whic may be produced in thismanner and the cross section of the dies for producing them, suchcross-section being taken on lines corresponding to the line 3-3 of Fig.1.

Figs. 6 to 9 inclusive illustrate sections at successive points in thedies for forming the complete tube and the steps in its formation. Inthis form of the device, the main dies are indicated at 10 and 11, and.correspond in their structure and function to the dies shown in thecompanion application, one of these dies suchas the die 10 bein as inthe companion application, oscillata le toward and from the remainingdie such as the die 11, it not being deemed necessary to illustrate themachinery employed for this purpose. However, the die 11 is continuedrearwardly as at 12, and the die 10 has a rearwardly projecting tongue13 fitting in the rear pore tion 12 of the die 11. It will perhaps bebest understood how the device operates if it be assumed that it isdesired to manufacture such a tubular form, as is shown in Fig. 1. Inthis form, the main parts of the dies 10 and 11 act to bend the flatplate 14 up at each edge as shown at 15 in Fig. 2. As this trough shapeform passes rearwardl it engages the sides 16 of the auxiliary ben ingmember 12 which assists in raising the side portions. The floor of thedie 11 at the rear portion is provided with a slot 17 having arearwardly and downwardly inclined bottom Y18, and the ton ue 13 iscorres 0ndingly shaped to fit wit in the slot. nder these circumstances,the central portion of the trough shape partially finished member willbe bent; down so thatthe sides will fold up, as shown at 19 in Fig. 3,thus overlap-- ping the portions 15, as also shown in that figure. Thusthe rear portions of the dies constitute bending dies, while the frontportions constitute forming dies.

There has thus been provided a simple and eflicient device of the kinddescribed and for the purpose specified.

It is obvious. that minor changes may be made in the form andconstruction of the invention Without in any way departing from thematerial spirit thereof. It is not,

therefore, desired to confine the invention to the exact form hereinshown and described, but it is wished to include all such as proper- 1ycome within the scope claimed.

. Having thus described the invention, what is claimed as new, is:

Dies for producing tubular forms from strip material stock, comprising apair of relatively oscillatable main forming dies havingcomplementaryconfronting faces merging gradually in cross-section from thecrosssection of the stock toa cross-section of the required shape openedout to trough-like 'form, cooperating extensions on said dies a gradualand regular deepening of the for bending the sides of the trough-1ikeform groove and contration of its sides to a shape toward each other tocause the same to asconforming to the same portion of the tube, 10 sumetubular form, one of said extensions the other extension beingcomplementary 5 being provided with a groove merging from thereto.

a shape conforming to the central portion In testimony whereof I afiixmy signature. of the trough-like partially formed tube by FREDERICKGOATES.

